Safety nut for screws and bolts



April 21, 1931. G. T. COOKE SAFETY NUT FOR SCREWS AND BOLTS Filed Dec .10. 1929 INVENTOR d. W

. III/I ATTORNEYS.

. Referring to sents the end of a bolt having Patented Apr. 21,1931

' PATENT OFFICE GEORGE '1. 'COOKE, OI SOUTI-LNORWALK, CONNECTICUT sum NUT FOR SCREWS AND BOLTS Original application filed April 12,1928, Serial No. 269,379. Divided and this application filed December 10, 1829. Serial No. 412,954.

This invention relates to certain new and useful improvements in bolts and nuts and cons1sts primarily in the nut construction which is designed to be locked by a cotter pin I inwhich the ends of the cotter pin are automatically opened or spread by the mere insertion of the same into its operative position. This application is a division of my former application for U. S. Letters Patent, Serial No. 269,379, filed April 12, 1928.

The main object of this invention is to provide simple and efiicient means whereby a nut may have a wide range of adjustment with relation to the part which it is holding and be locked against turning on a bolt in its adjusted position by means of a cotter pin, which, upon the mere application of the same, has its ends automatically spread into holding position.

In the drawings- Fig. 1 is a plan view of my invention;

Fig. 2 is a section on the line 2-2 of Fig. 1. that particular form of the invention shown in the drawings, 1 reprethe usual cotter pin passage extending diametrically therethrough. 2 is a cotter in. 3 is a nut having an even number of at surfaces arranged around its periphery for receiving a wrench, whereby the nut may be screwed up tightly on the t readed end of the bolt 1 by means of such a tool. On the outer face of the nut are a series. of wedges 7-1, the apex of each wedge bein preferably located closely up to the edge 0 the bolt passage through the nut. These wedges are provided in an odd instead of an even number and are so arranged that each wedge will iace'a radial passage. between two corresponding wedges on the other side of the threaded passage through the nut, whereby a cotter pin 2 may be passed into the pin passage through the bolt so that when it emerges therefrom, its

two ends will engage the apex of one of the wedges by which wedge said ends of the cotter pinwill be automatically spread apart as indicated in Fig. 1, when the cotter pm is pushed or driven into place.

In 0 rat1on when the nut is screwed onto the b0 t for the purpose of drawing up any device held thereby and it is desired to pro vide slight freedom, the operator may first screw the nut up as tightly aslpossible and then back it off to the point where the desired freedom is obtained, whereupon he is bound to find one of the radial passages in position orclose to the position that will permit the cotter pin to be inserted and automatically spread by being driven in. By providing a screwth'readed body, such as a nut, with an odd number of rad1al passages and the corresponding number of wedges. facing the same, twice the number of radial adjustments may be had per single turn as would be possible were said radial passages provided in an even number, as in the ordinary castellated nut well known in the art. For example, in the articular nut shown in the accompanying. rawings, seven radial passages with seven pin spreading wedges coacting therewith are shown, and fourteen adjustments per a single turn are possible.-

By the term cotter pin I mean to include any form of split pin capable of functioning for the purpose herein described. It shoul be understood that various modifications and changes may be made without departure from the scope of the appended claims.

A WhatIclaimis:

1. Ina pin lock for a bolt and nut construction, a bolt having near its end a diametrical passage open at its ends only for receiving a cotter n, a nut having an axial assage for said olt, an odd number of raial passages in said nut forming between them an odd number of cotter pin spreading wedges, the apex of each spreading wedge facing one of said radial passages at the osposite side of said nut to force the two en 2 of a cotter pin apart and against the opposite side walls of said pin passage insaid bolt when said pin ends emerge therefrom.

2. In a pin lock for a bolt and nut. construction, a bolt havingnear its end a diametrical passage open at its ends only for receiving a cotter pin, a nut having an axial passage for said bolt, an odd number of radial passages in said nut forming between them an odd number of cotter pin spreading wedges, the apex of each spreading wedge facing one of said radial passages at the o posite' side of said nut to force thetwo en s of a cotter pin apart and against the opposite. side walls of said pin passage in sand bolt when said in ends emerge therefrom, the spreading e ges of said wedges bein substantlally com'cident with the wall 0 the bolt passage through said nut to thereby engage the cotter pin ends immediately upontheir emergence from said passage.

GEORGE T. COOKE- 

